toluene-4-sulfonic acid in dichloromethane T=0°C; 1.25 h;
参考文献
Fox, Martin E.; Holmes, Andrew B.; Forbes, Ian T.; Thompson, Mervyn
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1994 , # 23 p. 3379 - 3396
in dimethyl sulfoxide T=5°C; 2 h; Inert atmosphere;
参考文献
Schwartz, Brett D.; Booth, Yvonne K.; Fletcher, Mary T.; Kitching, William; De Voss, James J.
Chemical Communications, 2010 , vol. 46, # 9 p. 1526 - 1528